The plural stone is often used when providing a weight (e.g. "this sack weighs 8 stone").[30] A person's weight is often quoted in stones and pounds in English-speaking countries that use the avoirdupois system, with the exception of the United States and Canada, where it is usually quoted in pounds.

quarter (qr or qtr)

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12.70058636

One quarter is equal to two stones or a quarter of a hundredweight. The term quarter was also commonly used to refer to a quarter of a pound in a retail context.

As with the US and Canadian[31] systems, twenty hundredweights equal a ton. The imperial hundredweight is 12% greater than the US and Canadian equivalent. The imperial ton (or long ton) is 2240 pounds, which is much closer to a metric tonne (about 2204.6pounds), compared to the short ton of 2000 pounds (907.185 kg).